South Korea here. FastMail website is down. IMAP is down. SMTP is down.

But if I use a VPN to go through another ISP, everything is fine.

EmailDiscussions is the same. It's down from my home ISP. I'm writing this using a VPN.

Looks like a network issue with some ISPs in some countries. Since both you and I are on the same side of the Pacific ocean relative to the FastMail servers in the U.S., maybe some of the undersea cables are to blame?